After you find clues to the Lightwarden's whereabouts, Almet leads you to the K'mul Astropolis.
This quest is available if you have completed the quest Top of the Tree.
Starting the Quest
Talk to Almet in the Rak'tika Greatwood to begin the quest.
Speak with Almet
Go northwest, attune to the Aetheryte if you haven't already, and continue going northwest to where the orange arrow is pointing in the minimap. Talk to Almet to proceed.
Speak with Y'shtola
Go to the quest icon on the map and talk to Y'shtola to proceed.
Use the Clay Tablets on the Inscriptions
There are four pyramids within the orange circle on the map. The west pyramids have stairs on the east side, and the east pyramids have stairs on the west side. Jump up the stairs to reach the top of each pyramid, then dismount and target the sparkling Ronkan Inscription, and then you can either examine or target it and use a Clay Tablet on it from the Key Items section of your inventory, or you can target it and use the icon to the right of the quest name in your list of active quests.
Going to the top of each pyramid and using the four Clay Tablets on the Ronkan Inscriptions at the top of each of the four pyramids will complete this quest objective.
Deliver the Clay Tablets to Y'shtola
Go to the quest icon on the map and talk to Y'shtola to hand over the Impressed Clay Tablets. There will be a cutscene.
Speak with Y'shtola Again
Before you speak with Y'shtola, you can talk to Almet if you need the riddle repeated. You can go south to examine all of the statues to help you solve the riddle.
When you have solved it, talk to Y'shtola and say Yes. The correct answer is .
Speak with Almet Again
Talk to Almet to complete the quest. There will be a cutscene.
Next Main Scenario Quest
After you complete the quest, talk to Almet to accept the next quest: Mi Casa, Toupasa.